gallbladder biliary intraepithelial neoplasia (MONDO_0006218) is a neoplastic, non-invasive lesion that affects the gallbladder epithelium. It is characterized by the presence of atypical epithelial cells with an increased nuclear/cytoplasmic ratio, nuclear hyperchromasia, and loss of nuclear polarity. Also known as: gallbladder BilIN, gallbladder dysplasia, gallbladder intraepithelial neoplasia, intracystic BilIN, intracystic biliary intraepithelial neoplasia.